CHANGELOG: update from cherry pick of etcd-io#9540

Author: jingyih

CHANGELOG-3.1.md

@@ -13,6 +13,11 @@ The minimum recommended etcd versions to run in **production** are 3.1.11+, 3.2.
 ### etcdctl
 
 - [Strip out insecure endpoints from DNS SRV records when using discovery](https://github.com/etcd-io/etcd/pull/10443) with etcdctl v2
+- Add [`etcdctl endpoint health --write-out` support](https://github.com/etcd-io/etcd/pull/9540).
+  - Previously, [`etcdctl endpoint health --write-out json` did not work](https://github.com/etcd-io/etcd/issues/9532).
+  - The command output is changed. Previously, if endpoint is unreachable, the command output is
+  "\<endpoint\> is unhealthy: failed to connect: \<error message\>". This change unified the error message, all error types
+  now have the same output "\<endpoint\> is unhealthy: failed to commit proposal: \<error message\>".
 
 ### Metrics, Monitoring
 

CHANGELOG-3.2.md

@@ -14,6 +14,11 @@ The minimum recommended etcd versions to run in **production** are 3.1.11+, 3.2.
 ### etcdctl
 
 - [Strip out insecure endpoints from DNS SRV records when using discovery](https://github.com/etcd-io/etcd/pull/10443) with etcdctl v2
+- Add [`etcdctl endpoint health --write-out` support](https://github.com/etcd-io/etcd/pull/9540).
+  - Previously, [`etcdctl endpoint health --write-out json` did not work](https://github.com/etcd-io/etcd/issues/9532).
+  - The command output is changed. Previously, if endpoint is unreachable, the command output is
+  "\<endpoint\> is unhealthy: failed to connect: \<error message\>". This change unified the error message, all error types
+  now have the same output "\<endpoint\> is unhealthy: failed to commit proposal: \<error message\>".
 
 ### Metrics, Monitoring
 

CHANGELOG-3.3.md

@@ -9,6 +9,20 @@ The minimum recommended etcd versions to run in **production** are 3.1.11+, 3.2.
 <hr>
 
 
+## [v3.3.14](https://github.com/etcd-io/etcd/releases/tag/v3.3.14) (2019-TBD)
+
+### etcdctl
+
+- Add [`etcdctl endpoint health --write-out` support](https://github.com/etcd-io/etcd/pull/9540).
+  - Previously, [`etcdctl endpoint health --write-out json` did not work](https://github.com/etcd-io/etcd/issues/9532).
+  - The command output is changed. Previously, if endpoint is unreachable, the command output is
+  "\<endpoint\> is unhealthy: failed to connect: \<error message\>". This change unified the error message, all error types
+  now have the same output "\<endpoint\> is unhealthy: failed to commit proposal: \<error message\>".
+
+
+<hr>
+
+
 ## [v3.3.13](https://github.com/etcd-io/etcd/releases/tag/v3.3.13) (2019-05-02)
 
 See [code changes](https://github.com/etcd-io/etcd/compare/v3.3.12...v3.3.13) and [v3.3 upgrade guide](https://github.com/etcd-io/etcd/blob/master/Documentation/upgrades/upgrade_3_3.md) for any breaking changes. **Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.3 upgrade guide](https://github.com/etcd-io/etcd/blob/master/Documentation/upgrades/upgrade_3_3.md).**
@@ -53,6 +67,11 @@ See [code changes](https://github.com/etcd-io/etcd/compare/v3.3.11...v3.3.12) an
 ### etcdctl
 
 - [Strip out insecure endpoints from DNS SRV records when using discovery](https://github.com/etcd-io/etcd/pull/10443) with etcdctl v2
+- Add [`etcdctl endpoint health --write-out` support](https://github.com/etcd-io/etcd/pull/9540).
+  - Previously, [`etcdctl endpoint health --write-out json` did not work](https://github.com/etcd-io/etcd/issues/9532).
+  - The command output is changed. Previously, if endpoint is unreachable, the command output is
+  "\<endpoint\> is unhealthy: failed to connect: \<error message\>". This change unified the error message, all error types
+  will have the same output "\<endpoint\> is unhealthy: failed to commit proposal: \<error message\>".
 
 ### Go